/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

MemoryInputStream::MemoryInputStream (const void* sourceData, size_t sourceDataSize, bool keepCopy)
    : data (sourceData),
      dataSize (sourceDataSize)
{
    if (keepCopy)
    {
        internalCopy = MemoryBlock (sourceData, sourceDataSize);
        data = internalCopy.getData();
    }
}

MemoryInputStream::MemoryInputStream (const MemoryBlock& sourceData, bool keepCopy)
    : data (sourceData.getData()),
      dataSize (sourceData.getSize())
{
    if (keepCopy)
    {
        internalCopy = sourceData;
        data = internalCopy.getData();
    }
}

MemoryInputStream::MemoryInputStream (MemoryBlock&& source)
    : internalCopy (std::move (source))
{
    data = internalCopy.getData();
    dataSize = internalCopy.getSize();
}

MemoryInputStream::~MemoryInputStream() = default;

int64 MemoryInputStream::getTotalLength()
{
    return (int64) dataSize;
}

int MemoryInputStream::read (void* buffer, int howMany)
{
    jassert (buffer != nullptr && howMany >= 0);

    if (howMany <= 0 || position >= dataSize)
        return 0;

    auto num = jmin ((size_t) howMany, dataSize - position);

    if (num > 0)
    {
        memcpy (buffer, addBytesToPointer (data, position), num);
        position += num;
    }

    return (int) num;
}

bool MemoryInputStream::isExhausted()
{
    return position >= dataSize;
}

bool MemoryInputStream::setPosition (const int64 pos)
{
    position = (size_t) jlimit ((int64) 0, (int64) dataSize, pos);
    return true;
}

int64 MemoryInputStream::getPosition()
{
    return (int64) position;
}

void MemoryInputStream::skipNextBytes (int64 numBytesToSkip)
{
    if (numBytesToSkip > 0)
        setPosition (getPosition() + numBytesToSkip);
}


//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

class MemoryStreamTests final : public UnitTest
{
public:
    MemoryStreamTests()
        : UnitTest ("MemoryInputStream & MemoryOutputStream", UnitTestCategories::streams)
    {}

    void runTest() override
    {
        beginTest ("Basics");
        Random r = getRandom();

        int randomInt = r.nextInt();
        int64 randomInt64 = r.nextInt64();
        double randomDouble = r.nextDouble();
        String randomString (createRandomWideCharString (r));

        MemoryOutputStream mo;
        mo.writeInt (randomInt);
        mo.writeIntBigEndian (randomInt);
        mo.writeCompressedInt (randomInt);
        mo.writeString (randomString);
        mo.writeInt64 (randomInt64);
        mo.writeInt64BigEndian (randomInt64);
        mo.writeDouble (randomDouble);
        mo.writeDoubleBigEndian (randomDouble);

        MemoryInputStream mi (mo.getData(), mo.getDataSize(), false);
        expect (mi.readInt() == randomInt);
        expect (mi.readIntBigEndian() == randomInt);
        expect (mi.readCompressedInt() == randomInt);
        expectEquals (mi.readString(), randomString);
        expect (mi.readInt64() == randomInt64);
        expect (mi.readInt64BigEndian() == randomInt64);
        expectEquals (mi.readDouble(), randomDouble);
        expectEquals (mi.readDoubleBigEndian(), randomDouble);

        const MemoryBlock data ("abcdefghijklmnopqrstuvwxyz", 26);
        MemoryInputStream stream (data, true);

        beginTest ("Read");

        expectEquals (stream.getPosition(), (int64) 0);
        expectEquals (stream.getTotalLength(), (int64) data.getSize());
        expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
        expect (! stream.isExhausted());

        size_t numBytesRead = 0;
        MemoryBlock readBuffer (data.getSize());

        while (numBytesRead < data.getSize())
        {
            numBytesRead += (size_t) stream.read (&readBuffer[numBytesRead], 3);

            expectEquals (stream.getPosition(), (int64) numBytesRead);
            expectEquals (stream.getNumBytesRemaining(), (int64) (data.getSize() - numBytesRead));
            expect (stream.isExhausted() == (numBytesRead == data.getSize()));
        }

        expectEquals (stream.getPosition(), (int64) data.getSize());
        expectEquals (stream.getNumBytesRemaining(), (int64) 0);
        expect (stream.isExhausted());

        expect (readBuffer == data);

        beginTest ("Skip");

        stream.setPosition (0);
        expectEquals (stream.getPosition(), (int64) 0);
        expectEquals (stream.getTotalLength(), (int64) data.getSize());
        expectEquals (stream.getNumBytesRemaining(), stream.getTotalLength());
        expect (! stream.isExhausted());

        numBytesRead = 0;
        const int numBytesToSkip = 5;

        while (numBytesRead < data.getSize())
        {
            stream.skipNextBytes (numBytesToSkip);
            numBytesRead += numBytesToSkip;
            numBytesRead = std::min (numBytesRead, data.getSize());

            expectEquals (stream.getPosition(), (int64) numBytesRead);
            expectEquals (stream.getNumBytesRemaining(), (int64) (data.getSize() - numBytesRead));
            expect (stream.isExhausted() == (numBytesRead == data.getSize()));
        }

        expectEquals (stream.getPosition(), (int64) data.getSize());
        expectEquals (stream.getNumBytesRemaining(), (int64) 0);
        expect (stream.isExhausted());
    }

    static String createRandomWideCharString (Random& r)
    {
        juce_wchar buffer [50] = { 0 };

        for (int i = 0; i < numElementsInArray (buffer) - 1; ++i)
        {
            if (r.nextBool())
            {
                do
                {
                    buffer[i] = (juce_wchar) (1 + r.nextInt (0x10ffff - 1));
                }
                while (! CharPointer_UTF16::canRepresent (buffer[i]));
            }
            else
                buffer[i] = (juce_wchar) (1 + r.nextInt (0xff));
        }

        return CharPointer_UTF32 (buffer);
    }
};

static MemoryStreamTests memoryInputStreamUnitTests;

#endif

} // namespace juce
